Browsing by Author Nghiem, H. T. M.
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We investigate several definitions of the time-dependent spectral function A(ω,t) of the Anderson impurity model following a quench and within the time-dependent numerical renormalization group (TDNRG) method. In terms of the single-particle two-time retarded Green function Gr(t1,t2), the definitions we consider differ in the choice of the time variable t with respect to t1 and/or t2 (which we refer to as the time reference). In a previous study [H. T. M. Nghiem et al., Phys. Rev. Lett. 119, 156601 (2017)], we investigated the spectral function A(ω,t), obtained from the Fourier transform of Im[Gr(t1,t2)] with respect to the time difference t′=t1−t2, with time reference t=t2. Here, we ... |
